The idea itself is great (generic sending of text messages via free web sites), but unfortunately it hasn't picked up: no updates since 2003, nobody wrote drivers for other services than MTNSMS (now dead) and O2, and the sourceforge.net mailing list has a grand total of 3 messages since 2003.

A modern alternative, for which there are drivers as of 2009, is SMS::Send by Adam Kennedy (of ali.as fame).